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diff --git a/test/pleroma/web/gettext_test.exs b/test/pleroma/web/gettext_test.exs
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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.GettextTest do
+  use ExUnit.Case
+
+  require Pleroma.Web.Gettext
+
+  test "put_locales/1: set the first in the list to Gettext's locale" do
+    Pleroma.Web.Gettext.put_locales(["zh_Hans", "en_test"])
+
+    assert "zh_Hans" == Gettext.get_locale(Pleroma.Web.Gettext)
+  end
+
+  test "with_locales/2: reset locale on exit" do
+    old_first_locale = Gettext.get_locale(Pleroma.Web.Gettext)
+    old_locales = Pleroma.Web.Gettext.get_locales()
+
+    Pleroma.Web.Gettext.with_locales ["zh_Hans", "en_test"] do
+      assert "zh_Hans" == Gettext.get_locale(Pleroma.Web.Gettext)
+      assert ["zh_Hans", "en_test"] == Pleroma.Web.Gettext.get_locales()
+    end
+
+    assert old_first_locale == Gettext.get_locale(Pleroma.Web.Gettext)
+    assert old_locales == Pleroma.Web.Gettext.get_locales()
+  end
+
+  describe "handle_missing_translation/5" do
+    test "fallback to next locale if some translation is not available" do
+      Pleroma.Web.Gettext.with_locales ["x_unsupported", "en_test"] do
+        assert "xxYour account is awaiting approvalxx" ==
+                 Pleroma.Web.Gettext.dpgettext(
+                   "static_pages",
+                   "approval pending email subject",
+                   "Your account is awaiting approval"
+                 )
+      end
+    end
+
+    test "duplicated locale in list should not result in infinite loops" do
+      Pleroma.Web.Gettext.with_locales ["x_unsupported", "x_unsupported", "en_test"] do
+        assert "xxYour account is awaiting approvalxx" ==
+                 Pleroma.Web.Gettext.dpgettext(
+                   "static_pages",
+                   "approval pending email subject",
+                   "Your account is awaiting approval"
+                 )
+      end
+    end
+
+    test "direct interpolation" do
+      Pleroma.Web.Gettext.with_locales ["en_test"] do
+        assert "xxYour digest from some instancexx" ==
+                 Pleroma.Web.Gettext.dpgettext(
+                   "static_pages",
+                   "digest email subject",
+                   "Your digest from %{instance_name}",
+                   instance_name: "some instance"
+                 )
+      end
+    end
+
+    test "fallback with interpolation" do
+      Pleroma.Web.Gettext.with_locales ["x_unsupported", "en_test"] do
+        assert "xxYour digest from some instancexx" ==
+                 Pleroma.Web.Gettext.dpgettext(
+                   "static_pages",
+                   "digest email subject",
+                   "Your digest from %{instance_name}",
+                   instance_name: "some instance"
+                 )
+      end
+    end
+
+    test "fallback to msgid" do
+      Pleroma.Web.Gettext.with_locales ["x_unsupported"] do
+        assert "Your digest from some instance" ==
+                 Pleroma.Web.Gettext.dpgettext(
+                   "static_pages",
+                   "digest email subject",
+                   "Your digest from %{instance_name}",
+                   instance_name: "some instance"
+                 )
+      end
+    end
+  end
+
+  describe "handle_missing_plural_translation/7" do
+    test "direct interpolation" do
+      Pleroma.Web.Gettext.with_locales ["en_test"] do
+        assert "xx1 New Followerxx" ==
+                 Pleroma.Web.Gettext.dpngettext(
+                   "static_pages",
+                   "new followers count header",
+                   "%{count} New Follower",
+                   "%{count} New Followers",
+                   1,
+                   count: 1
+                 )
+
+        assert "xx5 New Followersxx" ==
+                 Pleroma.Web.Gettext.dpngettext(
+                   "static_pages",
+                   "new followers count header",
+                   "%{count} New Follower",
+                   "%{count} New Followers",
+                   5,
+                   count: 5
+                 )
+      end
+    end
+
+    test "fallback with interpolation" do
+      Pleroma.Web.Gettext.with_locales ["x_unsupported", "en_test"] do
+        assert "xx1 New Followerxx" ==
+                 Pleroma.Web.Gettext.dpngettext(
+                   "static_pages",
+                   "new followers count header",
+                   "%{count} New Follower",
+                   "%{count} New Followers",
+                   1,
+                   count: 1
+                 )
+
+        assert "xx5 New Followersxx" ==
+                 Pleroma.Web.Gettext.dpngettext(
+                   "static_pages",
+                   "new followers count header",
+                   "%{count} New Follower",
+                   "%{count} New Followers",
+                   5,
+                   count: 5
+                 )
+      end
+    end
+
+    test "fallback to msgid" do
+      Pleroma.Web.Gettext.with_locales ["x_unsupported"] do
+        assert "1 New Follower" ==
+                 Pleroma.Web.Gettext.dpngettext(
+                   "static_pages",
+                   "new followers count header",
+                   "%{count} New Follower",
+                   "%{count} New Followers",
+                   1,
+                   count: 1
+                 )
+
+        assert "5 New Followers" ==
+                 Pleroma.Web.Gettext.dpngettext(
+                   "static_pages",
+                   "new followers count header",
+                   "%{count} New Follower",
+                   "%{count} New Followers",
+                   5,
+                   count: 5
+                 )
+      end
+    end
+  end
+end